Bore gauging device



y 6, 3%? A. s. CZUBAK mmam BORE GAUG ING DEVI CE Filed Sept. 1, 19/64 5 Sheets-Sheet l m mmmi-umnun May 16, W6? A. s. CZUBAK 393299378 BORE GAUGING DEVICE Filed Sept. 1964 3 Sheets-Sheet L? INVENTOR. $252)? 9'. 6' 25/1 4} y 16, W57 A. s. CZUBAK 7 Q BORE GAUGING DEV [CE Filed Sept. 1, 1964 5 Sheets-Sheet 5 V INVENTOR.

W Z2??? 61 Claw/24v?) United States Patent 3,320,378 BORE GAUGHNG DEVICE Albin S. Czubak, Detroit, Mich, assignor to Micromatic Hone Corporation, Detroit, Mich, a corporation of Michigan Filed Sept. 4, 1964, Ser. No. 394,500 6 Claims. (Cl. ZOO-61.41)

This invention relates to gauging devices, and particularly to a gauging device adapted to effect a desired result such as to terminate the operation of a bore enlarging machine or energize an indicator when the workpiece bore is enlarged to a desired diameter.

In bore enlarging machines such as those used in finishing cylindrical bores, a tool spindle is mounted for rotary and reciprocating movement within the bore and carries therein the bore finishing tools. In machines of this type, it is customary to provide a bore gauging device adjacent the finishing tool assembly with the gauge entering the bore each tool stroke. Such a gauge is generally constructed to gauge the bore size during each tool stroke and is adapted to energize an indicator or terminate operation of the machine when the bore reaches a predetermined size. While a gauge of this type provides an accurate control for the bore finishing operation, care must be taken to insure that the finished bore is not scratched or otherwise marred thereby during movement of the gauge therein.

The gauging device of the present invention is designed for free axial entry into and withdrawal from the workpiece bore without contacting it and is designed to undergo no axial movement relative to the bore during the gauging step. The actual gauging operation is carried out by radial movement of a portion of the gauge during a time when the gauge assembly is axially within the bore and undergoes no axial movement relative thereto.

This gauging device is designed for use with a variety of reciprocating bore finishing machines and is mounted for axial movement with the tool spindle. A plurality of radially movable fingers are provided on the gauging device and are biased radially outwardly relative thereto into engagement with the bore wall after the gauge is positioned within the bore. With each stroke of the bore finishing process, the radial outward movement of the gauging fingers will increase progressively until the bore reaches a predetermined size at which time the finger movement will be sufiicient to cause actuation of a suitable means adapted to either inform an operator of the bore size or to automatically cease operation of the machine.

It is an object, therefore, of the present invention to provide a gauging device for use with a bore finishing machine operable to provide any suitable signal or terminate operation of the machine when the bore reaches a predetermined size.

It is a further object of the present invention to provide a bore gauging device of the above character in which the gauging elements will not be subjected to wear through contact with the bore wall.

It is a further object of the present invention to provide a bore gauging device of the above character wherein the finished bore Wall will not be damaged by the gauging elements.

It is a further object of the present invention to provide a bore gauging device of the above character operable to engage the bore wall during each finishing stroke.

It is a further object of the present invention to provide a gauging device for use with a bore finishing machine which is directly attachable to the machine spindle.

It is a further object of the present invention to provide a gauging device for use with a bore finishing machine which is adjustable to gauge a variety of bore sizes.

It is a further object of the present invention to provide a bore gauging device of the above character adapted for use with a variety of bore finishing machines.

It is a further object of the present invention to provide a bore gauging device of the above character which is easily removable and replaceable.

It is still a further object of the present invention to provide a bore gauging device of the above character which is relatively inexpensive to manufacture, rugged in construction and reliable in operation.

Further objects and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the drawings in which:

FIGURE 1 is a perspective view of a bore finishing machine having the device of the present invention installed thereon;

FIG. 2 is a sectional view of the gauging device of the device illustrated in FIG. 3 taken along the line 2-2 thereof shown with the tool assembly partially removed for clarity;

FIG. 3 is a sectional view of the device illustrated in FIG. 2 taken along the line 3-3 thereof; and

FIG. 4 is an elevational view of the gauging device of the present invention with the abutment sleeve partly broken away.

Referring now more specifically to the drawings, FIG. 1 illustrates a bore honing machine which is one type of bore finishing machine on which the present invention may be installed and which is intended to be illustrative only. The machine includes a frame 11 suitably supported on a fixed base 12 and having a stationary head 13 fixed thereto. A reciprocable ram or head 15 is carried by the lower end of a piston 17 suitably mounted within head 13 for vertical reciprocation relative thereto. A suitable hydraulic system energized from a control panel 18 may be connected to the head 13 for alternately supplying fluid thereto to reciprocate piston 17 in the usual manner. A conventional tool expansion cone mechanism 19 provided with a downwardly depending expanding rod 20 is carried by frame 11 and is adapted for movement within a rotating and reciprocating tool spindle 21 and tool drive shaft 23 in the usual manner. A conventional abrasive honing tool assembly including a tool holder 24 is operatively connected to the spindle through the drive shaft 23 which is rigidly fixed to the spindle 21 and joined to the tool holder 24 through a universal connection 22. In addition, a plurality of abrasive stones 26 may be disposed around the tool holder 24 and radially expandable relative thereto into engage ment with a bore wall of a workpiece through reciprocation of the cone expanding rod 20 in the usual manner. See FIG. 2.

A pair of guide bars 25 are fixed at their lower ends to a machine bracket 27 and each is slidably guided within aligned openings formed in ram 15 and a pair of flanges 28 and 30 formed on the head 13. A first pair of stop sleeves 29 are adjustably fixed to bars 25 and will limit downward movement thereof by engaging the upper edge of flange 30 while a second pair of stop sleeves 31 limit the upward movement of bars 25 and bracket 27 by engaging the lower edge of this flange.

A gauge bracket 33 is fixed at its rear portion to machine bracket 27 by suitable means and supports the bore gauge device of the present invention which is generally indicated at 35. The bore gauging device is shown more clearly in FIGS. 2-4 and is seen to include a plate member 37 suitably fixed to bracket 33. An annular sleeve 39 is shown as slidably disposed Within a recess 41 formed in plate 37. A plurality of bolts 43 having heads 44 are slidably disposed within openings 45 formed in plate 37 and are threadedly received at their lower ends within a flanged sleeve 47. A conventional dowel pin 48 serves to fix sleeve 47 to sleeve 39. A plurality of suitable nuts 49 adjustably lock each of the bolts 43 to the flanged sleeve while a plurality of compression springs 51 are interposed between nuts 49' and plate 37, one surrounding each bolt 43, respectively. Thus, the compression springs will normally maintain sleeve 47 in a position spaced downwardly from plate 37, with bolt heads 44 providing a downward limit stop therefor.

The flanged sleeve 47 may have fixed thereto one or a plurality of electrical switches 53 by suitable means such as bolts 55 and nuts 57. Each switch 53 may be formed with a conventional operating plunger 59' operatively connected to an electrical conduit 61 which, in turn, may be electrically connected to an indicator device or to the machine control as will be described, An operating sleeve 63 loosely surrounds sleeve 39 and has adjustably fixed thereto one or a plurality of plunger engaging bolt members 65. A plurality of pins 64 are carried by the operating sleeve and are slidably disposed in openings formed in flanged sleeve 47 to guide the operating sleeve on sleeve 39.

An actuating cone 67 is fixed to the lower end of the sleeve 39 by suitable means such as a plurality of pins 69, only one of which is shown, and is provided with an upper abutment surface 71 which will engage the lower surface of operating sleeve 63 to limit its downward movement. A plurality of flexible fingers 73 are fixed to the lower end of the operating sleeve in cantilever fashion by suitable bolt means 75 and reinforcing plate 76- and each has a downwardly extending portion freely positioned within a groove 77 formed in cone 67. Each finger 73 terminates at its lower end in an enlarged head 79 adapted to engage an upwardly and outwardly tapered surface 81 formed on the cone. Thus, as sleeve 39 moves downwardly relative to sleeve 63, tapered surface 81 will engage enlarged heads 79 on the fingers and move them radially outwardly.

The gauging device including cone 67 and fingers 73 is movable into and out of a workpiece bore 83 formed in a workpiece 86 suitably supported upon the frame 11 With each stroke of the abrading tool assembly. A suitably chamfered plate 84 is fixed to the lower end of cone 67 as by screws 85 to assist in centering the cone within the bore. Radial outward movement of the fingers 73 by cone 67 will be limited by engagement with the bore wall. This will, in turn, limit the downward movement of sleeve 39 and cone 67 relative to fingers 73.

A bushing 88, which may be fixed to the machine or to the work holding fixture, will engage an anular flange 90 formed on the operating sleeve 63 and will limit the movement of fingers 73 into the workpiece bore. Thus, during each downward stroke of the abrading tool and gauge assembly into the workpiece bore, the entire assembly will move as a unit until flange 90 abuts bushing 88. Thereafter, only the abrading tool and sleeve 39 and cone 67 will continue moving into the bore, the operating sleeve 63 and fingers 73 remaining stationary. During this time, tapered surface 81 will engage and move heads 79 of the flexible fingers outwardly into engagement with the bore wall and switch plunger 59 will be moved toward the plunger engaging bolt 65. It will be apparent then that as bore 83 is increased in size by each pass of the abrading device, the extent of the downward movement of cone 67 and sleeve 39 relative to fingers 73 and operating sleeve 63 will progressively increase. Thus, by suitably adjusting plunger engaging bolt 65,switch 53 can be actuated when bore 83 reaches the desired predetermined size. Actuation of switch 53 can serve to activate any suitable machine control device. For example, when the bore 83 reaches a predetermined size, actuation of switch 53 may interrupt the tool actuation control circuit energized from the control panel 18 in the usual manner and shut the abrading machine down; or, it may simply serve to motivate an indicator which may be disposed on the panel 18 to indicate that the predetermined bore size has been reached. However, the specific control circuit forms no part of this invention and has not been described in detail.

When the piston has reached the lower limit of its stroke, the flow of fluid to the head 13 will be reversed and the tool spindle will begin upward movement. During the first portion of the spindle upward movement, the sleeve 39, of the gauging assembly, will move therewith. This will continue until surface 71 of the cone abuts the lower edge of sleeve 63 after which this sleeve and fingers 73 will be withdrawn from the workpiece bore. However, when sleeve 63 begins upward movement, the tapered surface 81 will have moved upwardly away from the enlarged heads 79 of the gauging fingers there-by allowing them to. contract inwardly away from bore 83 by virtue of their cantilever mounting. Thus, relative axial movement between the gauging fingers and the workpiece bore will take place without contact therebetween. This, in turn, virtually eliminates wear in the gauging device and prevents the bore from being marred thereby.

It will be apparent from the foregoing that there has been provided a very reliable bore gauging device for a bore finishing machine effective to gauge the bore size at each tool pass with the danger of marring or scratching the bore face reduced to a minimum.

While a specific embodiment of the present invention has been illustrated and described in detail, it is to be understood that various additions, substitutions, modifications and omissions may be made thereto without departing from the spirit of the invention as encompassed by the appended claims.

What is claimed is:

1. In' a machine having a tool provided with a drive shaft for enlarging the bore of a workpiece,

a bracket disposed for movement toward and away from said bore in unison with tool movement,

a bore gauging device carried by said bracket and including a gauge b'ody encircling the drive shaft of the tool for reciprocation in and out of the bore,

said gauge body comprising a first sleeve having radially movable gauging fingers mounted thereon adapted to be freely received within the bore,

a second sleeve disposed within said first sleeve and having a portion thereof adapted to move said gauging fingers into contact with said bore upon relative movement between said first and second sleeves,

means supporting said second sleeve on said bracket for movement therewith and for longitudinal movement rel-ative thereto,

resilient means biasing said second sleeve away from said bracket and toward said bore,

electrical switch means adapted to be actuated upon a predetermined relative movement between said first and second sleeves,

mean operable to limit longitudinal movement of said first sleeve relative to the workpiece while permitting the continued longitudinal movement of said second sleeve with the tool as the tool is moved longitudinally of said bore, whereby the continued movement of the tool will cause said second sleeve to move said lingers into contact'with said bore,

2. In a machine having a tool provided with a drive shaft for enlarging the bore ofa workpiece,

a bracket disposed for movement toward and away from said bore in unison with tool movement,

a bore gauging device carried by said bracket and including a gauge body encircling the drive shaft of the tool for reciprocation in and out of the bore,

said gauge body comprising a first sleeve having radilally movable gauging fingers mounted thereon adapted to be freely received within the bore,-

a second sleeve disposed within said first sleeve and having a portion thereof adapted to move said gauging fingers into contact with said bore upon relative movement between said first and second sleeves,

said first sleeve being slid-ably disposed on said second sleeve for movement from a normal first position where said fingers are disposed inwardly of said bore to a second position where said fingers are moved outwardly into contact with said bore,

means supporting said second sleeve on said bracket for movement therewith and for longitudinal movement relative thereto,

resilient means biasing said second sleeve away from said bracket and toward said bore,

electrical switch means adapted to be actuated upon a predetermined relative movement between said first and second sleeves,

means operable to limit longitudinal movement of said first sleeve relative to the workpiece while permitting the continued longitudinal movement of said second sleeve with the tool as the tool is moved longitudinally of said bore, whereby the continued movement of the tool will cause said second sleeve to move said fingers into contact with said bore.

3. In 'a machine having a tool provided with a drive shaft for enlarging the bore of a workpiece,

\a bracket disposed for movement toward and away finom said bore in unison with tool movement,

a bore gauging device carried by said bracket and ineluding a gauge body encircling the drive shaft of the tool for reciprocation in and out of the bore,

said gauge body comprising a first sleeve having radially movable gauging fingers mounted thereon adapted to be freely received within the bore,

abutment means adapted to limit the movement of said first sleeve within the bore,

a second sleeve disposed within said first sleeve and having a portion thereof adapted to move said gauging fingers into contact with said bore upon relative movement between said first and second sleeves,

said first sleeve being slidably disposed on said second sleeve for movement from a normal first position where said fingers are disposed inwardly of said bore to a second position where said fingers are moved outwardly into contact with said bore,

means supporting said se'cond sleeve on said bracket for movement therewith and for longitudinal movement relative thereto,

resilient means biasing said second sleeve away from said bracket and toward said bore,

electrical switch means adapted to be actuated upon a predetermined relative movement between said first and second sleeves,

mean operable to limit longitudinal movement of said first sleeve relative to the workpiece while permitting the continued longitudinal movement of said second sleeve with the tool as the tool is moved longitudinally of said bore, whereby the continued movement of the tool will cause said second sleeve to move said fingers into contact with said bore.

4. In a machine having a tool provided with a drive shaft for enlarging the bore of a workpiece,

a bracket disposed iior movement toward and away firom said bore in unison with tool movement,

a bore gauging device carried by said bracket and including a gauge body encircling the drive shaft of the tool for reciprocation in and out of the bore,

said gauge body comprising a first sleeve having radially movable gauging fingers mounted thereon adapted to be freely received within the bore,

a second sleeve disposed within said first sleeve and having a portion thereof adapted to move said gauging fingers into contact with said bore upon relative movement between said first and second sleeves,

means supporting said second sleeve on said bracket for movement therewith and for longitudinal movement relative thereto,

resilient means biasing said second sleeve away from said bracket and toward said bore,

an electrical switch positioned on one of said sleeves, adjustable means on the other of said sleeves adapted to actuate said switch upon a predetermined relative movement between said first and second sleeves,

means operable to limit longitudinal movement of said first sleeve relative to the workpiece while permitting the continued longitudinal movement of said second sleeve with the tool as the tool is moved longitudinally of said bore, whereby the continued movement of the tool will cause said second sleeve to move said fingers into contact with said bore.

5. In a machine having a tool provided with a drive shaft for enlarging the bore of a workpiece,

a bracket disposed for movement toward and away from said bore in unison with tool movement,

a bore gauging device carried by said bracket and including a gauge body encircling the drive shaft of the tool for reciprocation in and out of the bore,

said gauge body comprising a first sleeve having radially movable gauging fingers mounted thereon adapted to be freely received within the bore,

a second sleeve disposed within said first sleeve and having a portion thereof adapted to move said gauging fingers into contact with said bore upon relative movement between said first and second sleeves,

said first sleeve being slidably disposed on said second sleeve for movement from a normal first position where said fingers are disposed inwardly of said bore to a second position where said fingers are moved outwardly into contact with said bore,

means supporting said second sleeve on said bracket for movement therewith and for longitudinal movement relative thereto,

resilient means biasing said second sleeve away from said bracket and toward said bore,

an electrical switch positioned on one of said sleeves, adjustable means on the other of said sleeves adapted to actuate said switch upon a predetermined relative movement between said first and second sleeves,

means operable to limit longitudinal movement of said first sleeve relative to the workpiece while permitting the continued longitudinal movement of said second sleeve with the tool as the tool is moved longitudinally of said bore, whereby the continued movement of the tool will cause said second sleeve to move said fingers into contact with said bore.

6. In a machine having .a tool provided with a drive shaft for enlarging the bore of a workpiece,

a bracket disposed for movement toward and away lirom said bore in unison with tool movement,

a bore gauging device carried by said bracket and ineluding a gauge body encircling the drive shaft of the tool for reciprocation in and out of the bore,

said gauge body com-prising a first sleeve having radially movable gauging fingers mounted thereon adapted to be freely received within the bore,

abutment means adapted to limit the movement of said first sleeve within the bore,

a second sleeve disposed within said first sleeve and having a portion thereof adapted to move said gauging fingers into contact with said bore upon relative movement between said first and second sleeves,

said first sleeve being slidably disposed on said second sleeve for movement from a normal first position where said fingers are disposed inwardly of said bore to a second position where said fingers are moved outwardly into contact with said bore,

means supporting said second sleeve on said bracket for movement therewith and for longitudinal move ment relative thereto,

resilient means biasing said second sleeve away from said bracket and toward said bore,

an electrical switch positioned on one of said sleeves, ardjusta ble means onthe other of said sleeves adapted to actwate said switch upon a predetermined relative movement between said first and second sleeves,

means operable to limit longitudinal movement of said first sleeve relative to the workpiece while permitting the continued longitudinal movement of said second sleeve with the tool as the tool is moved longitudinally of said bore, whereby the 'eontinued movement of the tool will cause said second sleeve to move said fingers into contact with said bore.

References Cited by the Examiner 5 UNITED STATES PATENTS 2,820,329 1/1958 Calvert 51165 2,842,858 7/1958 Mennesson 31178 10 BERNARD A. GILHEANY, Primary Examiner.

J. J. BAKER, H. B. GILSON, Assistant Examiners. 

1. IN A MACHINE HAVING A TOOL PROVIDED WITH A DRIVE SHAFT FOR ENLARGING THE BORE OF A WORKPIECE, A BRACKET DISPOSED FOR MOVEMENT TOWARD AND AWAY FROM SAID BORE IN UNISON WITH TOOL MOVEMENT, A BORE GAUGING DEVICE CARRIED BY SAID BRACKET AND INCLUDING A GAUGE BODY ENCIRCLING THE DRIVE SHAFT OF THE TOOL FOR RECIPROCATION IN AND OUT OF THE BORE, SAID GAUGE BODY COMPRISING A FIRST SLEEVE HAVING RADIALLY MOVABLE GAUGING FINGERS MOUNTED THEREON ADAPTED TO BE FREELY RECEIVED WITHIN THE BORE, A SECOND SLEEVE DISPOSED WITHIN SAID FIRST SLEEVE AND HAVING A PORTION THEREOF ADAPTED TO MOVE SAID GAUGING FINGERS INTO CONTACT WITH SAID BORE UPON RELATIVE MOVEMENT BETWEEN SAID FIRST AND SECOND SLEEVES, MEANS SUPPORTING SAID SECOND SLEEVE ON SAID BRACKET FOR MOVEMENT THEREWITH AND FOR LONGITUDINAL MOVEMENT RELATIVE THERETO, RESILIENT MEANS BIASING SAID SECOND SLEEVE AWAY FROM SAID BRACKET AND TOWARD SAID BORE, 